In an age where a game's launch day isn't the only time to have eyes on it, I think it's important to look back on games that have gotten significant updates overtime (especially those with dry or busted launches) so people are aware of what's been changed and added to give them some revitalized interest. I have some of my own stuff in mind which I'll mention now, and any others that happen to come to mind.

Tom Clancy's The Division 2 (PC, PS4/PS5, Xbox One/Series X/S) -As someone who's played both Division games, 2 just had a great core upgrade from what the first game offered, and they only built upon that overtime. The addition of the "Warlords of New York" expansion along with increased level caps and a new endgame activity called Manhunts make it so you have so much more to do, along with getting the entirety of New York from the first game to explore once again. New ways to optimize gear and seasonal activities + gameplay modifiers also mixed up the way endgame content is done, so you always have something to do and work towards that never feel like a waste of time. Ubisoft also plans to release the next major content update sometime this year (it was originally slated for Feburary but got postponed to later this year).

Shovel Knight Treasure Trove (Basically every modern platform) - I'm actually surprised how much Shovel Knight got updated beyond it's initial launch of the Shovel of Hope campaign, now having 3 other completely separate campaigns, and an entirely new game mode that turns it into a fighting game. Wild. The campaigns all have different gameplay styles and mechanics too. If you've been on the fence about Shovel Knight or haven't played it in a long time, you really should check it out again.

Animal Crossing: New Horizons (Switch) - Considering how NH came out right as the pandemic was becoming a big deal, it's safe to say that almost all of us who had a Switch played it. I myself only played religiously up until around May 2020 and didn't really play it much since then (mostly because I was getting back to work and other IRL nonsense). But lately I decided to pop back in and give it a go, and there is much more to do now. I always thought the initial progression of the game's beginning turned me off along with Nintendo just cutting out a lot of content that was in past entires in general (Which unfortunately they seem to be doing for a lot of the Switch generation). But all the stuff they've added since has made it a far more substancial package that gives you much more to do if you feel like you've done everything in years prior. Maybe go back to it if you feel like NH can scratch an itch you have.

Shantae Half Genie Hero + Shantae and the Seven Sirens (PC, PS4/PS5, Xbox One/Series X/S, Switch, Apple Arcade for Seven Sirens) - I lumped these two games together because they evolved in a similar way. I'm a huge fan of the Shantae series, but I was frankly disappointed with the initial launch of both HGH and Seven Sirens, but the post-launch updates added various game modes that drastically changed the experience in different ways, and are now a way more worthwhile package than they were back then. Half Genie Hero is particularly noteworthy because of the sheer amount of alternative game modes they offer that change the game in many different ways while also having lots of different outfits for Shantae. If you're interested, look for the ultimate edition of HGH, and the Seven Sirens' update was entirely free to the base game.

This is an interesting topic! Of the games you listed, I've only played AC New Horizons (though SK Treasure Trove is on my wish list) and I agree that it's worth a second chance. There is a lot more content now and the DLC is practically a second game. I wish I could think of more games to add to this but I'm drawing a blank.